[lkml]   [1998]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Security patch for /proc
On Tue, 31 Mar 1998, Chris Evans wrote:

> On Tue, 31 Mar 1998, Jeremy Fitzhardinge wrote:
> > Hi all,
> >
> > Here's a patch which prevents chrooted processes from escaping from
> > their chrooted area via /proc.
> Hi,
> I'm not sure I agree with this approach -- perhaps root processes should
> not be allowed to use the mount() syscall if root_dir != real_root. The
> other main source of nastiness is ptrace() -- this needs to be banned in a
> similar manner. There are other ways root could escape a chroot()
> jail, we need to think about them and eliminate them one by one.
- mknod()

Other are not that nasty, but still nasty:
- bind(): the lower ports are reserved to root, so another box may trust
that a connection is coming from a system program, and not a
user process.

But before changing the WELL established rules about chroot (and root in a
chroot environment was always dangerous), what about a new syscall:


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to

 \ /
  Last update: 2005-03-22 13:42    [W:0.114 / U:0.996 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site